IMPROVED ZEOLITIC MOLECULAR SIEVE FLUID CRACKING CATALYST MADE FROM KAOLIN CLAY BY IN SITU METHOD

摘要

An economical method of manufacturing enhanced fluidization (low density) catalysts by in situ crystallization of zeolite in precursor microspheres of calcined kaolin clay. The precursor microspheres are prepared by spray drying a slurry of kaolin clay all of which is hydrated (raw or uncalcined), the slurry being flocculated as a result of the presence of an alkaline water soluble sodium silicate in sufficient amount to achieve a slurry in a flocculated rather than deflocculated state. The slurry is spray dried and calcined. The calcined microspheres are reacted with an alkaline solution to crystallize the zeolite (synthetic crystalline faujasite) and ion-exchanged.